Hi there, two weeks ago I came to a resolution to make my own VGA waterblock, as I have at home more useless stock VGA coolers w/ copper base.
The choose was going on the old stock cooler from Sapphire X1800GTO
Here some pics how it is looking
I wanted to make the blok with an o-ring, normal fittings, but in our crappy town no way to buy an o-ring, so I made it the hard way, copper top with copper tubes soldered together
and here is the thicknes of the block (by comparing with an SE K530i)
fewer than 5mm
I made some test with teoretical flow and temp test
measured the theoretical flow by pumping 2litres water from one location to another and measured the time - then recalculated it for one hour
for the test I used a Laind DDC-1RT pump and Black Ice GT Stealth 360 Lite rad
by connecting only a Viscool CPU block the theoretical flow was cca. 180 litres per hour
by connecting the Viscool block and the Thin cool VGA block the theoretical flow was only cca. 85 litres per hour
so the block is very restrictive
and here´s a temp test
used a Leadtek Winfast 9600GT 512MB VGA card
measured the temps with AC Accelero S1 passive with high airflow in the case
temps w/ Accelero S1
idle...42°C
load...58°c
measured the temps with WC (Laing DDC-1RT, Black Ice GT Stealth 360 Lite+2x120mm Fans @ 12V, Thin cool VGA block)
idle...28°C
load...35°C
temperature in the room by making the tests was 23°C
the block needs only a surface adjusting for better looking
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though I have no idea what are you calling high airflow in the case 
Originally Posted by aspms*
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